Banking-screw for watches.



No. 815,271. PATENTED MAR. 13, 1906.

C. E. DE LONG. BANKING SCREW FOR WATCHES.

APPLICATION FILED JUNE 15, 1904. RENEWED NOT/.4, 1905.

UNITED STATES PATENT OFFICE.

CHARLES E. DE LONG, OF SOUTH MGALESTER, INDIAN TERRITORY, ASSIGNOR TOFRED MOINTYRE, OF SOUTH MCALESTER, INDIAN TERRITORY.

BANKING-SCREW FOR WATCHES.

Specification of Letters Patent.

Patented March 13, 1906.

To all whom it may concern:

Be it known that I, CHARLES E. DE LONG, a citizen of the United States,residing at South McAlester, Indian Territory, have invented a certainnew and useful Improvement in Banking-Screws for Watches, of which thefollowing is a full, clear, and exact description, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, forming part ofthis specification, in which Figure 1 is a plan view of a portion of thebanking-screw support, the escapementle ver, and the heads of thebanking-screws. Fig. 2 is a sectional view through the bank ing-screwsupport and the escapement-lever, the banking-screws being shown inelevation; and Fig. 3 is a detail view of the different banking-screwscommon to the single open- This invention relates to the escapementmechanism of watches; and the object there of is to provide meanswhereby a determined stroke or swing of the escapcment-lever can bemaintained at all times without any liability of the stroke beingchanged by accidentally turning the banking-screws or from other causes.I

In constructing a watch the bankingscrews are usually set for adetermined stroke of the fork or lever. Heretofore the banking-screwshave generally been of such a construction that the portions governingthe stroke of the escapement-lever were eccentric to the screw-heads andto the sockets which received the screws. In order to provide for thenecessary stroke of the escapement-lever, the screws may be turned sothat the distance between the sides of said portions of the screws maybe increased or diminished. In actual practice it has been found thatduring the cleaning of the watch these screws are frequentlyaccidentally disturbed. The slightest disarrangement of the screws issufficient to seriously change the stroke of the lever, so as to impairthe timekeeping qualities of the watch. It has also been found thatunskilled repairers frequently turn the screws in an endeavor toovercome imaginary errors, the result being that the proper adjustmentof the escapement has been destroyed. In assembling the parts at thefactory the proper adjustment for the stroke of the escapcment-lever ismathematically determined, and it is intended by the manufacturer thatafter the banking-screws have been set in place they are to remainpermanently as placed.

It is the purpose of this invention to provide means whereby theadjustment which is made in the factory cannot be destroyed by accidentor by any other cause.

In carrying out my invention I provide suitable sockets 1 and 2 in thebanking-screw support, (designated by the numeral 3.) These sockets areto be of uniform or standard sizes to receive the threaded heads 4 ofthe banking-screws 5, which threaded heads will. also be of standardsizes. The banking ends 6 of the screws, however, will be made up ofvarious sizes, which may be properly numbered and so designated by thetrade. For example, if the escapement-lever 7 is to have a determinedstroke the manufacturer will know that by inserting a banking-screw of acertain number or designated size the desired result will beaccomplished. Inasmuch as the receiving-sockets of the bankingscrewsupport are of a standard size, the banking-screws of whatever size willbe interchangeable, because the same-sized head will be provided forevery screw. After the screwshave been fixed in theirsupport it will beimpossible to vary the stroke of the escapement-lever, for the reasonthat the banking portions of the screws will in every instance beconcentric with the sockets and concentric with their respective heads.Therefore after the screws are in place should the screws beaccidentally turned the stroke of the lever will in no wise be affected.

I am aware that minor changes in the construction, arrangement, andcombination of the several parts of my device can be made andsubstituted for those herein shown and described without in the leastdeparting from the nature and principle of my invention;

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

A banking-screw support having threaded openings, interchangeablebanking screws I In testimony whereof I hereunto affix my havingenlarged heads at one end to impinge signature, in the presence of twowitnesses, against said support, threaded portions to this 26th day ofMay, 1904. engage said threaded openings, and banking CHARLES E. DELONG.

5 portions at the opposite ends, said banking Witnesses:

portions in different screws being of different I JOHN B. CHALLES,

sizes; substantially as described. 1 FRANK SMITH. i

